Example-code for timing based on millis() easier to understand through the use of example-numbers / avoiding delay()

[StefanL38]

This is a demo-code that shows the use of three different timers. Each with his own timer-variable where each timer has a different timePeriod

unsigned long DemoTimerA = 0; // variables that are used to store timeInformation
unsigned long DemoTimerB = 0; 
unsigned long DemoTimerC = 0; 
unsigned long DoDelayTimer = 0; 

// easy to use helper-function for non-blocking timing
boolean TimePeriodIsOver (unsigned long &startOfPeriod, unsigned long TimePeriod) {
  unsigned long currentMillis  = millis();
  if ( currentMillis - startOfPeriod >= TimePeriod ) {
    // more time than TimePeriod has elapsed since last time if-condition was true
    startOfPeriod = currentMillis; // a new period starts right here so set new starttime
    return true;
  }
  else return false;            // actual TimePeriod is NOT yet over
}

void setup() {
  Serial.begin(115200);
  Serial.println("Program started activate Show timestamp in serial monitor");
}

void loop() {
  if (  TimePeriodIsOver(DemoTimerA,1000)  ){
      Serial.println(" TimerA overDue");
    }
       
  if (  TimePeriodIsOver(DemoTimerB,2000)  ){
      Serial.println("                TimerB overDue");
    }

  if (  TimePeriodIsOver(DemoTimerC,3000)  ) {
      Serial.println("                               TimerC overDue");
    }

  if (  TimePeriodIsOver(DoDelayTimer,20000)  ){
      Serial.println("every 20 seconds execute delay(3500)... to make all other timers overdue");
      delay(3500);
    }    
}